Precisely because there are so many and because the competition especially in this sector is really huge, the more important question is exactly how to differ from the biggest competitors. Maybe so, and to achieve also a kind of monopoly on its own territory.
Above all, but of course not only for onlineshops optimizing the usability is interesting.

What is it? The term describes usability how user-friendly a website is. Whether a site is user-friendly or not can be determined by different criteria. For example, the menu is an important point, because the easier the people there get what they want, the better the chance that the user buys something.

Some vendors, such as the german company usability interactive, besides the actual performance of the usability tests also improve the usability and individual expansion opportunities. Thus, in addition to improving usability even though the placement in the search results will be improved.
In any case worth a look!